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Method and system for analyzing production induced stress before shale gas reservoir refracturing

A technology of repeated fracturing and induced stress, applied in special data processing applications, instruments, design optimization/simulation, etc., can solve the problem of unsuitable natural fracture development and low-porosity shale gas reservoirs, oil and gas without considering complex fracture distribution and multi-scale flow mechanism to achieve the effect of ensuring accuracy and efficiency

Pending Publication Date: 2022-05-10
CHENGDU NORTH OIL EXPLORATION DEV TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the current conventional oil and gas refracturing technology does not consider complex fracture distribution and multi-scale flow mechanism, and is not suitable for shale gas reservoirs with natural fracture development and low porosity and low permeability

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  • Method and system for analyzing production induced stress before shale gas reservoir refracturing
  • Method and system for analyzing production induced stress before shale gas reservoir refracturing
  • Method and system for analyzing production induced stress before shale gas reservoir refracturing

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Embodiment 1

[0061] Since the current conventional oil and gas refracturing technology does not consider complex fracture distribution and multi-scale flow mechanism, it is not suitable for shale gas reservoirs with developed natural fractures and low porosity and low permeability. In order to solve the above technical problems, this embodiment provides a production-induced stress analysis method before repeated fracturing of shale gas reservoirs. In this method, it is known that the partial flow area of ​​a typical shale gas reservoir has a size of 500m×500m×40m, within which there are 1300 natural fractures with a length of 5-15m randomly distributed, and 5 fractures distributed in the reservoir. hydraulic fractures parallel to each other with a spacing of 30m, such as figure 1 shown. Under the above background, the analysis method of production-induced stress before repeated fracturing of shale gas reservoir adopted in this embodiment includes the following steps:

[0062] Step 1: Est...

Embodiment 2

[0175] This embodiment provides a system corresponding to the production-induced stress analysis method before repeated fracturing of shale gas reservoirs described in Embodiment 1, including:

[0176] The permeability model establishment module is used to establish the multi-scale pore seepage apparent permeability model of shale gas reservoir;

[0177] Coupling model establishment module, used to establish fracture-matrix and fracture-fracture flow coupling models of shale gas reservoirs;

[0178] A seepage model establishment module, used to establish a multi-scale fluid-solid coupled horizontal well in a shale gas reservoir according to the shale gas reservoir multiscale pore seepage apparent permeability model and the shale gas reservoir flow coupling model seepage model;

[0179] The model parameter module is used to store physical parameters and assign parameters to each model;

[0180] The numerical processing module is used to perform numerical processing by using t...

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Abstract

The invention discloses a method and system for analyzing production induced stress before refracturing of a shale gas reservoir, and the method comprises the steps: building an apparent permeability model to consider complex gas flow behaviors under a multi-scale pore structure, building an embedded discrete fracture model, and coupling the flow of matrix-fracture and fracture-fracture systems; on the basis, a shale gas reservoir multi-scale flow-solid coupling horizontal well seepage model is established, and a fully implicit finite volume method is adopted for solving, so that the solving precision and efficiency are guaranteed. Therefore, the method accords with complex fracture distribution and a multi-scale flow mechanism, can truly reflect a rule of in-situ stress field change before refracturing, is used for simulating expansion of secondary hydraulic fractures, and is suitable for natural fracture development and low-porosity and low-permeability shale gas reservoirs.

Description

technical field [0001] The invention relates to the technical field of unconventional oil and gas exploitation, in particular to a production-induced stress analysis method and system before repeated fracturing of shale gas reservoirs. Background technique [0002] Horizontal well fracturing is the key technology for the commercial development of shale gas. The concept of “Reservoir Stimulated Volume (SRV)” was first proposed in the United States in 2006, and the segmented multi-cluster volume fracturing technology for shale gas horizontal wells has gradually been formed. In the process of early shale gas exploration and development, due to limitations and deviations in the understanding of reservoirs, the optimal design and process implementation of fracturing wells (or well sections) may not match the geological conditions of the reservoir, resulting in insufficient reservoir stimulation. The initial effect of fracturing is poor or the production declines rapidly after fra...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F30/28G06F119/14G06F113/08G06F111/10
CPCG06F30/23G06F30/28G06F2119/14G06F2113/08G06F2111/10
Inventor 黄静米中荣赵星袁浩曹献平成一崔小江陈哲邓琪张博宁
Owner CHENGDU NORTH OIL EXPLORATION DEV TECH
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